A136018 - cp's OEIS frontend

A136018 Triangle read by rows: r(n,k) = g(n,n-k), where g(n,k) is the number of ideals of size k in a garland (or double fence) of order n (see A137278).

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	3
7	3
8	3
9	1
10	7
11	6
12	6
13	4
14	1
15	15
16	14
17	12
18	10
19	5
20	1
21	33
22	32
23	27
24	22
25	15
26	6
27	1
28	75
29	72
30	63
31	50
32	37
33	21
34	7
35	1
36	171
37	164
38	146
39	118
40	88
41	58
42	28
43	8
44	1
45	391
46	377
47	338
48	280
49	212
50	147
51	86
52	36
53	9
54	1
55	899
56	870
57	786
58	662
59	514
60	366
61	234
62	122
63	45
64	10
65	1
66	2077
67	2014
68	1834
69	1564

[1, 1, 1, 1, 2, 1, 3, 3, 3, 1, 7, 6, 6, 4, 1, 15, 14, 12, 10, 5, 1, 33, 32, 27, 22, 15, 6, 1, 75, 72, 63, 50, 37, 21, 7, 1, 171, 164, 146, 118, 88, 58, 28, 8, 1, 391, 377, 338, 280, 212, 147, 86, 36, 9, 1, 899, 870, 786, 662, 514, 366, 234, 122, 45, 10, 1, 2077, 2014, 1834, 1564]

cp's OEIS Frontend

A136018 Triangle read by rows: r(n,k) = g(n,n-k), where g(n,k) is the number of ideals of size k in a garland (or double fence) of order n (see A137278).

Table of values

List of values